Metal-working machine



March 17, 1931. H, w PL 1,796,538

METAL WORKING MACHINE File g- ,1925 3 Sheets-Sheet l 1- N VEN TOR.

' Hurry Wfiuppk:

f p r 7 A TTO Filed ug- 1925 I5 Sheets-Sheet 2 I INVENTOR. Harry W. R upple March 17, 1931. w, RUPPLE 1,796,538

METAL WORKING MACHINE Filed Aug. 29; 1925 3 Sheet5-$heet 5 I N V EN TOR Hurry W. Rupp\e BY lit Patented Mar. 17, 1931 nnrsn STATES TE? OFFQE HARRY W. RUPPLE, OF CLEVELAND, OHIO, ASSEGNOR TO THE CLEVELAND AUTOMATIC MACHINE CO.

METAL-WORKIIIG- MACHINE Application filed August 29, 1925.

This invention relates to metal working machines and refers more particularly to im provements in the threading mechanism thereof, the purpose being to provide a machine of the class adapted to thread the ends of bolt blanks which will produce a more uniform character of threaded articles. In the present types of screw threading apparatus, it is customary to rotate either the threading die or the work, or both, and to positivelymove the die during the initial part of its travel until engaged upon the work, thereafter relying on such engagement to further advance the die. Other forms consist of means such as a cam adapted to engage a projection on'the die slide to move the same during its travel. In these present known constructions, it is found that after being in use for a short time, the wear on the parts results in an unevenly threaded product and therefore great diiiiculty has been encountered to produce a precision type of bolt.

This invention has for its general object to provide operating mechanism directly connected to the threading slide which is adapted to positively move the threading die at its proper pitch speed irrespective of the wear on the threading elements of such die. The present mechanism is especially designed to reduce as much as possible the wear in the operative elements of the slide advancing mechanism. A further ohject of the invention is to provide driving mechanism for rotating the work holder and (to-operative means actuated from such driving mechanism for operating the die slide feed mechanism.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mech anism embodying the invention such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

lln said annexed drawings Fig. 1 is a plan view of a single spindle die Serial No. 53,242.

metal working machine of which only the work holder spindle, the cooperating tool and their driving mechanism are shown.

F 2 is a front side elevation thereof.

Fig. 3 is an enlarged view partially in section of the threading die and its feeding mechanism.

Fig. 4 is a cross-sectional view taken on line l-4 of Fig. 3, looking in the direction of the arrows.

Fig. 5 is a detailed sectional view of the lead screw and the nut carrying head; and

Fig. 6 is a detailed view illustrating the mechanism for automatically opening the lead screw nuts.

Thepresent embodiment of the invention illustrated in the drawings describes an auto matic metal working machine of the single spindle class, having a work carrying mechanism mounted at one end of the bed plate and an aligned tool carrying mechanism mounted at the other end thereof. t is to be understood, however, tha the invention contemplates the adaptation of the present improvements in the threading die feeding mechanism on machines of tae multiple spindle class, or other types having a threaddie which is to be reciprocated with respect to the work.

The bed plate of the machine is indicated generally at 10 and the work carrying spindle 11, which latter member is suitably journ'aled in projections 12 on the top of the bed plate and has a chuck 13 on its front end.

lso journaled in projections 12 is a driving shaft 14 carrying a pulley l5 wiich may be connected to any suitable source of power. Spur gears 16 and 17 are mounted on shaft 14 at either side of said pulley. The gear 16 is arranged to drive the spindle 11 through a gear 18 mounted thereon, while the gear 17 meshes with a gear 19 mounted on a longitudinally extended shaft 20. The shaft 20 is carried by vertical brackets 21 provided on the bed plate 10 and serves to actuate the threading die feeding mechanism, as will appear more fully hereinafter.

The work carrier herein shown consist-s of the hollow spindle type having the usual means (not shown) located at its far end for of" Kid having b en operated upon by the threading mechanism.

The threading die is indicated in the drawing: at 25 and is carried on the front end of a longitudinally extended slide 26 journaled in projections 27 of a bracket 28 mounted on the top of the bed plate 10. The die 25 may be of the self opening and closing type having a co-operating stop 29 adjustably positioned in advance of the same for opening); and a yoke member 30 adapted to enaaee the die in its rearward movement to close the same preparatory to the succeeding; threading; operation. The rcarwardly projecting portion 31 of the slide 26 is of tubular cross section as shown in he. 3 and carries therein means as a lea d screw 32 which is adapted to advance the threading: die at exactly the proper pitch sneer 0n the slide 26 between. the brackets 27 is fixed an arm which projects downwardly and slidably engages a stub shaft 34 mounted by the brackets 27 parallel with the slide This arrange-amen permhts reciprocation of the slide 26 while preventing rotation thereof.

Shaft 20 hereinbefore referred to extends to the far one of bracket 28, being supported thereon by vertical projection 36 and having: spur gear 87 secured to its end. A second gear 38 carried on the lead screw shaft 39 meshes with the gear 37 and establishes driving relation between the lead screw ant the pulley 15. The shaft an l let d scre v 3: are projected interioraly of the tube and have bearin tl e forrva rd end in a bushing 40 mounted 2 a should r 41 on the inside of such. tube, it being apparent that as the threading die is advanced. the tube 31 moves longritiulina ly with respect to the shaft 39. 'lllunefore the forward end of such latter shaft is p ected a suitable distance beyond the bu 40 to insure thereof the tinie whcn t e threadin e is in its advanced position. The ene.v of the sh ft 35) is iournaled in bushii r l l 3t; and is provided ich serves to lock the onejitudi al movement.

ted in the proiecti with a split cellar 4.14: same from relative l A thrust bearing 45 15 l lc-ioned between the collar 44: ard the face of the bra t 36.

The construcrio above provides screw whicl is immediately 3 of the lead Jill 11g upon the pitch of the tl-r die. The collar tdis first removed from the shaft and then the entire lead screw and shaft 89 may be pulled .'l u descri ed may be used wth several different lead screws. To iniuro positive driving relation between the shaft 89 and the lead screw, the ear end of which screw may be provided with a slotted portion to engage with a transverse pin 51 mounted in the shaft 3 Carried on the rear end of the tubular threading die slide 31 is an annular member 52 in which are mounted a pair of half nuts The n iber 02 is fixedly mounted on the end of sh a6 31 in any desired manner, the construction being here shown in detail in screw threading the same thereon and locking the parts together by a set screw 5d. The half nut": 53 are located diametricc of the member 52 to engage opposite SluQS of the lead screw 32 when moved toward eaco other, it being obvious therefore that when so engaged the die slide rill be adced up In rotation of the lead screw. It will also be apparent that on account of the arm 33 the member will he held from rotation. Projecting longitudinally from one side of the nuts 53 are pins 55 which are received in eccentric slots 56 provided in an oscillatory shell. 57. This shell 57 is of cup shape having its annular wall fitted to the rior of the n ember 52, and its base por- 1 provided with the slots 56 and an openig in which is received the lead screw. h or ed at the t p of shell 5"? is a cam progecr' (30 adopted to be engaged by a cam 61 arried by an operating arm 62. The arm 62 is fixed to a rotatable sleeve 63 supported 1 C 5: tween the brackets 27 and 36 by bearings sh ft 20. As seen in Fig. -l, the is pivoially mounted on the arm 02 about a fxll 65 and engaging against one surrace t r r: as a spring: pressed plunger 66. in the constr 1 :tron of a rotating screw and such impropeij' engagement occur, the spring thread pressec plunger will permit a certain yield- 111;; the cam 61 until the cad screw has rotatet a suiii threading die spindles between brackets 21 is a cam shaft 7 O carrying thereon a cam drum 71 disposed adjacent the threading die spindle. This cam shaft may be driven by suitable gearing (not shown) from the pulley shaft 14-. Mounted on one end of the cam drum 71 is a cam plate 72 adapted to engage cam roller 73 carried at the outer end 74 of an arm 75, which latter member is mounted on the sleeve The cam drum is also provided with peripheral cam plate 76 adapted to engage at intervals a cam roller 77 mounted on a rearwardly projecting portion 78 of the arm 33. In operation the cam 72 serves to engage the half nuts 53 with the lead screw while the cam 76 is employed to return the threading die slide to its initial starting position, the pitch of cam 7 6 being acute to rap idly return such slide.

The invention also contemplates the provision of means automatically operated to cause the separation of the half nuts from the lead screw just prior to the engagement of the roll 77 with the cam 76. As seen in Figs. i and 6, these means comprise a spring pressed plunger member 80 mounted in the shell 57 and having an outwardly projecting pin 81 and collar 82. The inner end of the plunger is adapted to engage against the shoulder 83 of a recessed portion 84 in the member 52 to hold the shell together with the half nuts 53 in locked or engaged relationship with the lead screw. Also mounted on the shell 57 is a pivoted arm 85 having one end bifurcated at 86 to engage around the pin 81 under collar 82, and the other end 87 projected forwardly beyond the edge of the member 52. Carried in the adjacent bracket 27 is an adjustable cam pin 88 having its end inclined at 89 to engage the end 87 of arm 85 as the die slide is advanced. This pin 88 is adjusted to withdraw the plunger 80 from the recess in the member 52 at the time when the threading of the article is completed. Means for automatically rotating the shell 57 to withdraw the half nuts from engagement with the lead screw consist of compression springs 90 mounted in recesses 91 in the member and engaging latterly projecting pins 92 fixed in the shell 57.

To reduce the strain and to strengthen the lead screw mechanism, the present invention proposes to construct such lead screw with threads having one-half the pitch of the threads desired to be formed on the article. The same obviously provides a more rigid and more uniform feed of the die slide.-

Consequently, the speed of the lead screw must be twice that of the work. which may be easily accomplished by providing the proper gear ratio between the gears 17 and 19.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. In a threading machine of th charactcr described, the combination of a work holder, a threading die aligned therewith, a reciprocable slide carrying said die, driving means for rotating said work holder, a rotatable lead screw mounted coaxially of said slide, said screw being adapted to actuate said die slide in its advancing movement, and said screw being held from longitudinal movement with said slide, and means for actuating said lead screw from said driving means.

2. In a machine of the character described,

the combination of a rotatable work holder,

driving means therefor, a threading die mounted at one end of a reciprocable slide, a revoluble cam, feeding means mounted coaxially of said slide adapted to advance the same at the proper pitch speed of the die threading elements, means actuated from said cam for effecting the operation of said feeding means, and means operated from said cam for returning said slide.

3. In a threading machine of the character described, the combination of a rotatable work holder, driving means therefor, a threading die mounted at one end of a reciprocable slide, rotatable feeding means mounted coaxially of said slide, means for en aging said feeding means with said slide, and intermittently operated means for actuatin said en 'a 'm means said feedin b D b 7 '3 means being held from longitudinal move ment with said slide.

4:. In a threading machine of the character described, the combination of a rotatable work holder, driving means therefor, a threading die mounted at one end of a reciprocable slide, a rotatable lead screw mounted in the other end of said slide, and intermittently operated means adapted to engage said screw with. said slide to positively move the latter during its threading movement, said. screw being held from longitudinal'movement with said slide.

5. In a threading machine of the character described, the combination of a rotatable work holder, driving means therefor, a threading die mounted at one end of a reciprocable slide, a lead screw mounted coaXially of said slide, means for rotating said screw from said driving means, and means operated from the driving means for intermittently engaging said screw with said 7 slide.

6. In a threading machine of the character described, the combination of a rotatable work holder, driving means therefor, a threading die mounted at one end of a reciprocable slide, a lead screw mounted coax- IUD ially of said slide, said screw being held from longitudinal movement, means for engaging said screw with said slide at the limit of its retracted movement, and means for disengaging said screw from the slide at the limit of its forward movement.

7. In a machine of the character described, the combination of a rotatable work holder, driving means therefor, athreading die mounted at one end of a reciprocable slide, a rotatable lead screw mounted coaxially of said slide, means for engaging said screw with said slide at the limit of its retracted movement, means for disengagingsaid screw from the slide at the limit of its forward movement, and means for returning said slide to starting position independently of said lead screw.

8. In a threading machine of the character described, the combination of a non-rotatable reciprocable slide, a threading die mounted on one end thereof, a rotatable lead screw coaxially mounted in the other end thereof, and separable half-nuts carried by said slide adapted to engage with said lead screw.

9. In a threading machine of the character described, the combination of a non-rotatable reciprocable slice. a threading die mounted on one end thereof, a rotatable lead screw coaxially mounted in the other end thereof, said screw being held from reciprocation with said slide, separable half-nuts carried by said slide, and means for engaging said nuts with said lead screw to actuate said slide in its threading movement.

10. In a threading machine of the character described, the combination of a non-rotatable reciprocable slide, a threading die mounted on one end thereof, a rotatable lead screw coaXially mounted in the other end thereof, separable half-nuts carried by said slide, automatically operated means adapted to engage said nuts with said screw at the starting position of the threading die, and means for disengaging said nuts at the completion of the threading movement.

11. In a machine of the character described, the combination of a non-rotatable reciprocable slide, a threading die mounted on one end thereof, a rotatable lead screw mounted in the other end thereof, an enlarged annular member mounted on said other end of the slide, transversely movable half-nuts mounted in said member, arotatable shell mounted on said member, and means actuated by the rotation of said shell for engaging said nuts with said lead screw.

12. In a machine of the character described, the combination of a non-rotatable reciprocable tubular slide, a rotatable lead screw mounted in one end thereof, an enlarged annular member mounted on said end, half-nuts carried by said member, a rotatable shell mounted on said member having eccentric slots therein, pins on said halfnuts projecting into said slots, and means for rotating said shell to engage said nuts with said lead screw.

13. In a machine of the character described, the combination of a reciprocable tubular slide, a rotatable lead screw mounted in one end thereof, an enlarged annular member mounted on said end, half-nuts carried by said member, a rotatable shell mounted on said member having eccentric slots therein, pins on said half-nuts projecting into said slots, means for rotating said shell to engage said nuts with said lead screw, and means for locking said nuts in engaged position.

14. In a machine of the character described, the combination of a reciprocable tubular slide. a rotatable lead screw mounted in one end thereof, an enlarged annular member mounted on said end, half-nuts carried by said member, a rotatable shell mounted on said member having eccentric slots therein, pins on said half-nuts projecting into said slots, means for rotating said shell to engage said nuts with said lead screw, and means carried by said shell adapted to cooperate with a recess in said member to retain said nuts in engaged position.

15. In a machine of the character described, the combination of a recijn'oeable tubular slide, a rotatable lead screw mounted in one end thereof, an enlarged annular member mounted on said end, half-nuts carried by said member, a rotatable shell mounted on said member having eccentric slots therein, pins on said half-nuts projecting into said slots, means for rotating said shell to engage said nuts with said lead screw. means for locking said nuts in engaged po sition, and spring pressed means adapted to rotate said shell to disengage said nuts upon release of said locking means.

16. In a machine of the character described, the combination of a reciprocable tubular slide, a rotatable lead screw mounted in one end thereof. an enlarged annular member mounted on said end, half-nuts car ried by said member, a rotatable shell mounted on said member having eccentric slots therein. pins on said half-nuts projecting into said slots, a cam projection on said shell, and a rotatable cam adapted to engage said projection to rotate said shell.

17. In a machine of the character described, the combination of a reciprocable tubular slide, a rotatable lead screw mounted in one end thereof, an enlarged annular mem ber mounted on said end, half-nuts carried by said member, a rotatable shell mounted on said member having eccentric slots there in, pins on said half-nuts projecting into said slots, a cam projection on said shell, a rotatable arm, and a yielding cam carried by said arm adapted to engage said to rotate said shell.

18; In a threading machine of the character described, the combination of a rotatable work holder, an aligned reciprocating slide, a threading die mounted on the front end, of said spindle, a rotatable lead screw mount ed coaxially in the other end of said slide, means for rota-ting said screw, means for engaging said screw with said slide to positively move the latter during its threading movement, means for disengaging said screw from the slide upon the completion of said threading movement and means for holding said screw from longitudinal movement.

19. In a machine of the character described, the combination of a non-rotatable reciprocating hollow slide, a rotatable lead screw mounted coaxially within said slide, a bearing mounted within said slide for slidably supporting the inner end of said screw, and means mounted externally of said slide for supporting the outer end of the lead screw.

Signed by me this 18th day of August, 1925.

HARRY W. RUPPLE.

cam projection 

